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The Rocky Mountain district sales manager of JCM, Inc., a college book publishing company, claims that each of his sales representatives makes 40 calls on professors per week. Several reps said that this estimate is too low. To research the claim, a random sample of 28 reps revealed that the mean number of calls made last week was 42. The standard deviation of the sample was computed to be 2.1 calls. At the .05 level of significance, can we conclude that more than 40 calls are made on the average in a week?
The Wilcoxon rank sum of the ranks for group and The value of the Wilcoxon signed rank statistic
MATH1550H: Assignment: Questions: Let’s assume the department of Mathematics of Trent University has 11 faculty members. For i = 0; 1; 2; 3; find pi, the probability that i of them were born on Canada Day using the binomial distributions.
Suppose a population proportion is .40, and 80% of the time when you draw a random sample from this population you get the sample proportion of .35 or more.
Compute a 90% confidence interval of the mean for a Weschler intellegence test with mean of 100.00 and standard deviation of 15.00 for a sample of 100 people. Use two decimal places.
A simple random sample of 50 adults is obtained, and each person's red blood cell count (in cells per micro-liter) is measured. The sample mean is 5.23. The population standard deviation for red blood cell counts is 0.54.
A geography teacher is interested in the link between mathematical ability and the ability to visualize three dimensional situations.He gives a group of 15 students a test and records each students score
What sample size and acceptable level would result in a probability of .05 that a good batch will be rejected and a probability of .10 that a bad batch will be accepted?
The mean of a normal probability distribution is 60; the standard deviation is 5.
Does this sample give sufficient evidence to conclude that self-esteem scores for group-participation adolescents are significantly different from those of general population? Use two-tailed test with α = .01.
(a) Compute the arithmetic mean of the subscribers' incomes. (b) Compute the modal and median incomes.
Discuss the fields in which Poisson distribution is applied. Why does it matter whether a population of arrivals is limited or unlimited?
Assume that the president is correct and p = 0.26. What is the sampling distribution of for this study? What is the probability that the sample proportion will be between .20 and .40 (to 4 decimals)?
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